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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

821 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.02 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

18 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.25 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.47 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
D
Third-Party Impact
Action
64% third-party, 0 ms blocking
FIX
64% third-party, 0 ms blocking
Warning::
Third-party code accounts for 64% of page weight (1020.5 KiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
36%
64%
First-party Third-party
F
JS Bundles
Action
27 scripts, 604 KB unused
FIX
27 scripts, 604 KB unused
Warning::
https://pagead2.googlesyndication.com/pagead/manag...: 138 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://serverfault.com/Content/Js/full-anon.en.js...: 94 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202602.1...: 78 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S812...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 604 KB
604 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31098007188 KB138 KB (74%)✓3rd
https://serverfault.com/Content/Js/full-anon.en.js?v=037e97b07fca129 KB94 KB (73%)✓1st
https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js129 KB78 KB (61%)✓3rd
https://accounts.google.com/gsi/client96 KB72 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT20 KB62 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2154 KB62 KB (40%)✓3rd
https://s.lngtdv.com/serverfault/default.1776784667.js71 KB43 KB (62%)✓3rd
https://serverfault.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b32 KB32 KB (99%)✓1st
https://serverfault.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd30 KB22 KB (71%)✓1st
https://serverfault.com/px.js?ch=10 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
62 resources · 1.6 MB · 604 KB savings available
FIX
62 resources · 1.6 MB · 604 KB savings available
Warning::
Page weight 569 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~604 KB of savings available
Warning::
37 third-party resources (64% of weight)
62 resources · 1.6 MiB · 37 third-party 568.5 KiB over 1MB target
JavaScript 71% · 1.1 MiB
CSS 12% · 189.8 KiB
Other 8% · 128.8 KiB
Image 7% · 107.0 KiB
Document 2% · 35.3 KiB

~603.8 KiB of savings available

Remove unused JavaScript: 603.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.6 MB transferred, 62 requests
REVIEW
1.6 MB transferred, 62 requests
Info::
Page weighs 8.2 MB (1.6 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
62 HTTP requests
Info::
Estimated 0.33 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
62 requests
0.33 g CO2 per page load
JavaScript 1.1 MiB 71%
CSS 185.1 KiB 12%
Images 106.3 KiB 7%
Other 104.8 KiB 7%
HTML 35.3 KiB 2%
Other 24.0 KiB 2%
Other 5.3 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

B
Image Optimization
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://serverfault.com/Content/Sites/serverfault/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 106 KB
0 oversized -0 KB
16 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
818ms total JS execution
REVIEW
818ms total JS execution
Info::
Unattributable: 205ms CPU time
Info::
https://serverfault.com/: 177ms CPU time
Info::
https://cdn.cookielaw.org/consent/b7645c37-9f82-4d...: 135ms CPU time
Info::
https://pagead2.googlesyndication.com/pagead/manag...: 81ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-S812...: 77ms CPU time
Warning::
Third-party scripts: 569ms (70% of total)

Main Thread Breakdown

Script Evaluation 52% Other 15% Script Parsing & Compilation 14% Style & Layout 11% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable205ms41ms0ms3rd
https://serverfault.com/177ms19ms5ms1st
https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/OtAutoBlock.js135ms86ms48ms3rd
https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=3109800781ms60ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT277ms63ms14ms3rd
https://serverfault.com/cdn-cgi/challenge-platform/scripts/jsd/main.js72ms69ms1ms1st
https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js71ms34ms18ms3rd
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
62 requests over 2634ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 821 ms LCP 2.0 shttps://serverfault.com// https://serverfault.com/ — 200 — 35.3 KiB — 234 ms — h2https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/OtAutoBlock.jscdn.cookielaw.org/consent/b7645c37-... https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/OtAutoBlock.js — 200 — 155.7 KiB — 70 ms — h2https://cdn.cookielaw.org/scripttemplates/gpp.stub.jscdn.cookielaw.org/scripttemplates/g... https://cdn.cookielaw.org/scripttemplates/gpp.stub.js — 200 — 1.8 KiB — 37 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 35 ms — h2https://serverfault.com/Content/Js/google-analytics.en.js?v=48615a9a9bc4/Content/Js/google-analytics.en.js?... https://serverfault.com/Content/Js/google-analytics.en.js?v=48615a9a9bc4 — 200 — 2.4 KiB — 28 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js — 200 — 30.4 KiB — 66 ms — h2https://serverfault.com/Content/Js/stub.en.js?v=e307fb81e738/Content/Js/stub.en.js?v=e307fb81e7... https://serverfault.com/Content/Js/stub.en.js?v=e307fb81e738 — 200 — 18.0 KiB — 31 ms — h2https://serverfault.com/Content/Shared/stacks.css?v=b2264ccf0463/Content/Shared/stacks.css?v=b2264c... https://serverfault.com/Content/Shared/stacks.css?v=b2264ccf0463 — 200 — 110.2 KiB — 35 ms — h2https://serverfault.com/Content/Sites/serverfault/primary.css?v=b1157ab5e089/Content/Sites/serverfault/primary.... https://serverfault.com/Content/Sites/serverfault/primary.css?v=b1157ab5e089 — 200 — 69.6 KiB — 36 ms — h2https://serverfault.com/Content/Shared/Channels/channels.css?v=d431b1be5a03/Content/Shared/Channels/channels.c... https://serverfault.com/Content/Shared/Channels/channels.css?v=d431b1be5a03 — 200 — 4.7 KiB — 17 ms — h2https://serverfault.com/px.js?ch=1/px.js?ch=1 https://serverfault.com/px.js?ch=1 — 200 — 390 B — 480 ms — h2https://serverfault.com/px.js?ch=2/px.js?ch=2 https://serverfault.com/px.js?ch=2 — 200 — 520 B — 169 ms — h2https://serverfault.com/Content/Sites/serverfault/Img/logo.svg?v=43f5b6d5f65b/Content/Sites/serverfault/Img/logo... https://serverfault.com/Content/Sites/serverfault/Img/logo.svg?v=43f5b6d5f65b — 200 — 1.9 KiB — 21 ms — h2https://lngtd.com/serverfault.jslngtd.com/serverfault.js https://lngtd.com/serverfault.js — 200 — 2.4 KiB — 26 ms — h2https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/b7645c37-9f82-4dfb-b719-2b5d032b2a75.jsoncdn.cookielaw.org/consent/b7645c37-... https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/b7645c37-9f82-4dfb-b719-2b5d032b2a75.json — 200 — 2.6 KiB — 28 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 285 B — 32 ms — h2https://serverfault.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd/Content/Js/third-party/npm/@stacko... https://serverfault.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd — 200 — 30.5 KiB — 31 ms — h2https://serverfault.com/Content/Js/sprinkles/cookie-consent.en.js?v=7ee6963139c5/Content/Js/sprinkles/cookie-consen... https://serverfault.com/Content/Js/sprinkles/cookie-consent.en.js?v=7ee6963139c5 — 200 — 934 B — 17 ms — h2https://serverfault.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b/Content/Js/webpack-chunks/svelte.e... https://serverfault.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b — 200 — 32.1 KiB — 15 ms — h2https://serverfault.com/Content/Js/webpack-chunks/stacks-svelte.en.js?v=297d3b9a88f6/Content/Js/webpack-chunks/stacks-s... https://serverfault.com/Content/Js/webpack-chunks/stacks-svelte.en.js?v=297d3b9a88f6 — 200 — 12.8 KiB — 13 ms — h2https://serverfault.com/Content/Js/webpack-chunks/9366.en.js?v=c8d4e4e64bf3/Content/Js/webpack-chunks/9366.en.... https://serverfault.com/Content/Js/webpack-chunks/9366.en.js?v=c8d4e4e64bf3 — 200 — 8.4 KiB — 12 ms — h2https://serverfault.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96/Content/Js/islands/signup-modal.en... https://serverfault.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96 — 200 — 8.4 KiB — 14 ms — h2https://serverfault.com/Content/Js/islands/one-tap.en.js?v=102f0378a2cf/Content/Js/islands/one-tap.en.js?v... https://serverfault.com/Content/Js/islands/one-tap.en.js?v=102f0378a2cf — 200 — 1.8 KiB — 13 ms — h2https://serverfault.com/Content/Js/sprinkles/left-nav-events.en.js?v=2ac13fd60bf6/Content/Js/sprinkles/left-nav-even... https://serverfault.com/Content/Js/sprinkles/left-nav-events.en.js?v=2ac13fd60bf6 — 200 — 1.2 KiB — 10 ms — h2https://i.sstatic.net/bZnyC8zU.jpg?s=32i.sstatic.net/bZnyC8zU.jpg?s=32 https://i.sstatic.net/bZnyC8zU.jpg?s=32 — 200 — 1.2 KiB — 54 ms — h3https://www.gravatar.com/avatar/a007be5a61f6aa8f3e85ae2fc18dd66e?s=32&d=identicon&r=PGwww.gravatar.com/avatar/a007be5a61f... https://www.gravatar.com/avatar/a007be5a61f6aa8f3e85ae2fc18dd66e?s=32&d=identicon&r=PG — 200 — 917 B — 11 ms — h2https://i.sstatic.net/2FYHI.png?s=32i.sstatic.net/2FYHI.png?s=32 https://i.sstatic.net/2FYHI.png?s=32 — 200 — 2.0 KiB — 28 ms — h3https://i.sstatic.net/fGz6O.jpg?s=32i.sstatic.net/fGz6O.jpg?s=32 https://i.sstatic.net/fGz6O.jpg?s=32 — 200 — 1.2 KiB — 25 ms — h3https://www.gravatar.com/avatar/b780cd615c9faf0a5a82fcd7f9b4e8a7?s=32&d=identicon&r=PG&f=y&so-version=2www.gravatar.com/avatar/b780cd615c9... https://www.gravatar.com/avatar/b780cd615c9faf0a5a82fcd7f9b4e8a7?s=32&d=identicon&r=PG&f=y&so-version=2 — 200 — 1.4 KiB — 4 ms — h2https://www.gravatar.com/avatar/5760d5980e8238fcb20317c04b9817ab?s=32&d=identicon&r=PG&f=y&so-version=2www.gravatar.com/avatar/5760d5980e8... https://www.gravatar.com/avatar/5760d5980e8238fcb20317c04b9817ab?s=32&d=identicon&r=PG&f=y&so-version=2 — 200 — 1.2 KiB — 4 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 821 ms LCP 2.0 shttps://serverfault.com// https://serverfault.com/ — 200 — 35.3 KiB — 234 ms — h2https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/OtAutoBlock.jscdn.cookielaw.org/consent/b7645c37-... https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/OtAutoBlock.js — 200 — 155.7 KiB — 70 ms — h2https://cdn.cookielaw.org/scripttemplates/gpp.stub.jscdn.cookielaw.org/scripttemplates/g... https://cdn.cookielaw.org/scripttemplates/gpp.stub.js — 200 — 1.8 KiB — 37 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 35 ms — h2https://serverfault.com/Content/Js/google-analytics.en.js?v=48615a9a9bc4/Content/Js/google-analytics.en.js?... https://serverfault.com/Content/Js/google-analytics.en.js?v=48615a9a9bc4 — 200 — 2.4 KiB — 28 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js — 200 — 30.4 KiB — 66 ms — h2https://serverfault.com/Content/Js/stub.en.js?v=e307fb81e738/Content/Js/stub.en.js?v=e307fb81e7... https://serverfault.com/Content/Js/stub.en.js?v=e307fb81e738 — 200 — 18.0 KiB — 31 ms — h2https://serverfault.com/Content/Shared/stacks.css?v=b2264ccf0463/Content/Shared/stacks.css?v=b2264c... https://serverfault.com/Content/Shared/stacks.css?v=b2264ccf0463 — 200 — 110.2 KiB — 35 ms — h2https://serverfault.com/Content/Sites/serverfault/primary.css?v=b1157ab5e089/Content/Sites/serverfault/primary.... https://serverfault.com/Content/Sites/serverfault/primary.css?v=b1157ab5e089 — 200 — 69.6 KiB — 36 ms — h2https://serverfault.com/Content/Shared/Channels/channels.css?v=d431b1be5a03/Content/Shared/Channels/channels.c... https://serverfault.com/Content/Shared/Channels/channels.css?v=d431b1be5a03 — 200 — 4.7 KiB — 17 ms — h2https://serverfault.com/px.js?ch=1/px.js?ch=1 https://serverfault.com/px.js?ch=1 — 200 — 390 B — 480 ms — h2https://serverfault.com/px.js?ch=2/px.js?ch=2 https://serverfault.com/px.js?ch=2 — 200 — 520 B — 169 ms — h2https://serverfault.com/Content/Sites/serverfault/Img/logo.svg?v=43f5b6d5f65b/Content/Sites/serverfault/Img/logo... https://serverfault.com/Content/Sites/serverfault/Img/logo.svg?v=43f5b6d5f65b — 200 — 1.9 KiB — 21 ms — h2https://lngtd.com/serverfault.jslngtd.com/serverfault.js https://lngtd.com/serverfault.js — 200 — 2.4 KiB — 26 ms — h2https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/b7645c37-9f82-4dfb-b719-2b5d032b2a75.jsoncdn.cookielaw.org/consent/b7645c37-... https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/b7645c37-9f82-4dfb-b719-2b5d032b2a75.json — 200 — 2.6 KiB — 28 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 285 B — 32 ms — h2https://serverfault.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd/Content/Js/third-party/npm/@stacko... https://serverfault.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd — 200 — 30.5 KiB — 31 ms — h2https://serverfault.com/Content/Js/sprinkles/cookie-consent.en.js?v=7ee6963139c5/Content/Js/sprinkles/cookie-consen... https://serverfault.com/Content/Js/sprinkles/cookie-consent.en.js?v=7ee6963139c5 — 200 — 934 B — 17 ms — h2https://serverfault.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b/Content/Js/webpack-chunks/svelte.e... https://serverfault.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b — 200 — 32.1 KiB — 15 ms — h2https://serverfault.com/Content/Js/webpack-chunks/stacks-svelte.en.js?v=297d3b9a88f6/Content/Js/webpack-chunks/stacks-s... https://serverfault.com/Content/Js/webpack-chunks/stacks-svelte.en.js?v=297d3b9a88f6 — 200 — 12.8 KiB — 13 ms — h2https://serverfault.com/Content/Js/webpack-chunks/9366.en.js?v=c8d4e4e64bf3/Content/Js/webpack-chunks/9366.en.... https://serverfault.com/Content/Js/webpack-chunks/9366.en.js?v=c8d4e4e64bf3 — 200 — 8.4 KiB — 12 ms — h2https://serverfault.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96/Content/Js/islands/signup-modal.en... https://serverfault.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96 — 200 — 8.4 KiB — 14 ms — h2https://serverfault.com/Content/Js/islands/one-tap.en.js?v=102f0378a2cf/Content/Js/islands/one-tap.en.js?v... https://serverfault.com/Content/Js/islands/one-tap.en.js?v=102f0378a2cf — 200 — 1.8 KiB — 13 ms — h2https://serverfault.com/Content/Js/sprinkles/left-nav-events.en.js?v=2ac13fd60bf6/Content/Js/sprinkles/left-nav-even... https://serverfault.com/Content/Js/sprinkles/left-nav-events.en.js?v=2ac13fd60bf6 — 200 — 1.2 KiB — 10 ms — h2https://i.sstatic.net/bZnyC8zU.jpg?s=32i.sstatic.net/bZnyC8zU.jpg?s=32 https://i.sstatic.net/bZnyC8zU.jpg?s=32 — 200 — 1.2 KiB — 54 ms — h3https://www.gravatar.com/avatar/a007be5a61f6aa8f3e85ae2fc18dd66e?s=32&d=identicon&r=PGwww.gravatar.com/avatar/a007be5a61f... https://www.gravatar.com/avatar/a007be5a61f6aa8f3e85ae2fc18dd66e?s=32&d=identicon&r=PG — 200 — 917 B — 11 ms — h2https://i.sstatic.net/2FYHI.png?s=32i.sstatic.net/2FYHI.png?s=32 https://i.sstatic.net/2FYHI.png?s=32 — 200 — 2.0 KiB — 28 ms — h3https://i.sstatic.net/fGz6O.jpg?s=32i.sstatic.net/fGz6O.jpg?s=32 https://i.sstatic.net/fGz6O.jpg?s=32 — 200 — 1.2 KiB — 25 ms — h3https://www.gravatar.com/avatar/b780cd615c9faf0a5a82fcd7f9b4e8a7?s=32&d=identicon&r=PG&f=y&so-version=2www.gravatar.com/avatar/b780cd615c9... https://www.gravatar.com/avatar/b780cd615c9faf0a5a82fcd7f9b4e8a7?s=32&d=identicon&r=PG&f=y&so-version=2 — 200 — 1.4 KiB — 4 ms — h2https://www.gravatar.com/avatar/5760d5980e8238fcb20317c04b9817ab?s=32&d=identicon&r=PG&f=y&so-version=2www.gravatar.com/avatar/5760d5980e8... https://www.gravatar.com/avatar/5760d5980e8238fcb20317c04b9817ab?s=32&d=identicon&r=PG&f=y&so-version=2 — 200 — 1.2 KiB — 4 ms — h2https://www.gravatar.com/avatar/36e86e58df538c4c7607470c90733656?s=32&d=identicon&r=PG&f=y&so-version=2www.gravatar.com/avatar/36e86e58df5... https://www.gravatar.com/avatar/36e86e58df538c4c7607470c90733656?s=32&d=identicon&r=PG&f=y&so-version=2 — 200 — 1.4 KiB — 4 ms — h2https://www.gravatar.com/avatar/e70d3453d63c0b4609327275d237f368?s=32&d=identicon&r=PGwww.gravatar.com/avatar/e70d3453d63... https://www.gravatar.com/avatar/e70d3453d63c0b4609327275d237f368?s=32&d=identicon&r=PG — 200 — 1.7 KiB — 6 ms — h2https://www.gravatar.com/avatar/1e4f21050949e63c1ed638e426ac0f77?s=32&d=identicon&r=PG&f=y&so-version=2www.gravatar.com/avatar/1e4f2105094... https://www.gravatar.com/avatar/1e4f21050949e63c1ed638e426ac0f77?s=32&d=identicon&r=PG&f=y&so-version=2 — 200 — 1.6 KiB — 7 ms — h2https://www.gravatar.com/avatar/7cb526dd14289c3799d5efb585c55265?s=32&d=identicon&r=PGwww.gravatar.com/avatar/7cb526dd142... https://www.gravatar.com/avatar/7cb526dd14289c3799d5efb585c55265?s=32&d=identicon&r=PG — 200 — 1.1 KiB — 9 ms — h2https://www.gravatar.com/avatar/05001f9a7cc21ba290ca85fca0980334?s=32&d=identicon&r=PG&f=y&so-version=2www.gravatar.com/avatar/05001f9a7cc... https://www.gravatar.com/avatar/05001f9a7cc21ba290ca85fca0980334?s=32&d=identicon&r=PG&f=y&so-version=2 — 200 — 958 B — 8 ms — h2https://i.sstatic.net/dittq.jpg?s=32i.sstatic.net/dittq.jpg?s=32 https://i.sstatic.net/dittq.jpg?s=32 — 200 — 1.4 KiB — 25 ms — h3https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2 — 200 — 154.4 KiB — 268 ms — h2https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js — 200 — 129.0 KiB — 17 ms — h2https://serverfault.com/Content/Img/favicons-sprite16.png?v=7c49858b1c47/Content/Img/favicons-sprite16.png?... https://serverfault.com/Content/Img/favicons-sprite16.png?v=7c49858b1c47 — 200 — 87.6 KiB — 15 ms — h2https://s.lngtdv.com/serverfault/default.1776784667.jss.lngtdv.com/serverfault/default.17... https://s.lngtdv.com/serverfault/default.1776784667.js — 200 — 70.5 KiB — 140 ms — h2https://serverfault.com/Content/Sites/serverfault/Img/icon-48.png?v=6b7c3ee65dd2/Content/Sites/serverfault/Img/icon... https://serverfault.com/Content/Sites/serverfault/Img/icon-48.png?v=6b7c3ee65dd2 — 200 — 357 B — 13 ms — h2https://accounts.google.com/gsi/clientaccounts.google.com/gsi/client https://accounts.google.com/gsi/client — 200 — 96.3 KiB — 279 ms — h2https://serverfault.com/cdn-cgi/challenge-platform/scripts/jsd/main.js/cdn-cgi/challenge-platform/scripts... https://serverfault.com/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 374 B — 20 ms — h2https://serverfault.com/Content/Js/full-anon.en.js?v=037e97b07fca/Content/Js/full-anon.en.js?v=037e9... https://serverfault.com/Content/Js/full-anon.en.js?v=037e97b07fca — 200 — 128.8 KiB — 27 ms — h2https://serverfault.com/Content/Js/explore-qlist.en.js?v=ee2a4f8c3992/Content/Js/explore-qlist.en.js?v=e... https://serverfault.com/Content/Js/explore-qlist.en.js?v=ee2a4f8c3992 — 200 — 831 B — 21 ms — h2https://serverfault.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?/cdn-cgi/challenge-platform/h/b/scr... https://serverfault.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 13.3 KiB — 13 ms — h2https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/019cdde0-bd83-77c0-b105-9b9aa3b6b6f1/en.jsoncdn.cookielaw.org/consent/b7645c37-... https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/019cdde0-bd83-77c0-b105-9b9aa3b6b6f1/en.json — 200 — 96.0 KiB — 40 ms — h2https://serverfault.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.26267945896456757:1776888748:d8ZJUSqLLzxkOsprZnYwJCPyd_cwcfeIlxdsgOjd-T0/9f075db089112684/cdn-cgi/challenge-platform/h/b/jsd... https://serverfault.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.26267945896456757:1776888748:d8ZJUSqLLzxkOsprZnYwJCPyd_cwcfeIlxdsgOjd-T0/9f075db089112684 — 200 — 1.0 KiB — 9 ms — h2https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otFloatingRoundedCorner.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otFloatingRoundedCorner.json — 200 — 3.0 KiB — 12 ms — h2https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otCommonStyles.css — 200 — 4.7 KiB — 13 ms — h2https://bd.lngtd.com/id.txtbd.lngtd.com/id.txt https://bd.lngtd.com/id.txt — 200 — 586 B — 63 ms — h2https://floors.lngtd.com/?account=serverfault&section=defaultfloors.lngtd.com/?account=serverfau... https://floors.lngtd.com/?account=serverfault&section=default — 200 — 1.4 KiB — 105 ms — h2https://pagead2.googlesyndication.com/tag/js/gpt.jspagead2.googlesyndication.com/tag/j... https://pagead2.googlesyndication.com/tag/js/gpt.js — 200 — 33.8 KiB — 132 ms — h3https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2 — 200 — 0 B — 3 ms — h2data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='96' height='96' viewBox='0 0 96…www.w3.org/2000/svg' width='96' hei... data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='96' height='96' viewBox='0 0 96… — 200 — 0 B — 0 ms — datahttps://cdn.cookielaw.org/logos/static/ot_close.svgcdn.cookielaw.org/logos/static/ot_c... https://cdn.cookielaw.org/logos/static/ot_close.svg — 200 — 513 B — 10 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-S812YQPLT2&gtm=45je64k0v891607717za200zd891607717&_p=1776889613881&gcs=G100&gcd=13q3q3q3q5l1&npa=1&dma_cps=-&dma=0&_eu=EA&are=1&cid=1657303692.1776889614&frm=0&ir=1&pscdl=denied&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~117384405~117512542&sid=1776889614&sct=1&seg=0&dl=https%3A%2F%2Fserverfault.com%2F&dt=Server%20Fault&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.requestid=c81d6945-da17-4fb8-96e4-3670c7e5acef&ep.routename=Home%2FIndex&ep.ads_blocked=false&tfd=1448www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-S812YQPLT2&gtm=45je64k0v891607717za200zd891607717&_p=1776889613881&gcs=G100&gcd=13q3q3q3q5l1&npa=1&dma_cps=-&dma=0&_eu=EA&are=1&cid=1657303692.1776889614&frm=0&ir=1&pscdl=denied&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~117384405~117512542&sid=1776889614&sct=1&seg=0&dl=https%3A%2F%2Fserverfault.com%2F&dt=Server%20Fault&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.requestid=c81d6945-da17-4fb8-96e4-3670c7e5acef&ep.routename=Home%2FIndex&ep.ads_blocked=false&tfd=1448 — 204 — 549 B — 176 ms — h2https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31098007pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31098007 — 200 — 187.7 KiB — 14 ms — h3https://pagead2.googlesyndication.com/pagead/managed/dict/m202604210101/gptpagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 58 ms — h3https://accounts.google.com/gsi/styleaccounts.google.com/gsi/style https://accounts.google.com/gsi/style — 200 — 641 B — 62 ms — h2https://serverfault.com/Content/Sites/serverfault/Img/favicon.ico?v=18e9cc4f2aea/Content/Sites/serverfault/Img/favi... https://serverfault.com/Content/Sites/serverfault/Img/favicon.ico?v=18e9cc4f2aea — 200 — 671 B — 13 ms — h2https://pagead2.googlesyndication.com/pagead/ping?e=1pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/ping?e=1 — 204 — 20 B — 58 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
70% of JavaScript execution is third-party
First-party Third-party 569ms · 472KB · $8/mo
Unattributable
Other
Costly
Execution 205ms
Transfer 0 KB
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 135ms
Transfer 156 KB
Monthly Cost $2/mo
pagead2.googlesyndication.com
Other
Optional
Execution 81ms
Transfer 188 KB
Unused 74%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 0 KB
Unused 40%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 71ms
Transfer 129 KB
Unused 61%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 205ms and costs ~$3/month

70% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 205ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

74% of pagead2.googlesyndication.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

61% of OneTrust's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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